ACADuser Posted August 24, 2015 Share Posted August 24, 2015 So you can not modify a floor truss like you can a roof truss? I have a truss that needs to step down to a room with a lower floor level & CA drew the truss equal height on both ends. If I could break the top cord & pull the part down that I need it would work. I wanted to show this truss in section view so the step down was obvious. Link to comment Share on other sites More sharing options...
DavidJPotter Posted August 25, 2015 Share Posted August 25, 2015 You can unlock the Truss layer and then edit trusses that Chief Architect makes or you can create your own using poly-line solids and poly-line solid holes any shape you like, just takes a little longer. Since I am not a State LIcensed Structural Engineer, I would not do this without a consulting Engineer. DJP Link to comment Share on other sites More sharing options...
ACADuser Posted August 25, 2015 Author Share Posted August 25, 2015 Thanks David. Not looking to make trusses you would build just like the roof trusses are not for construction but for general information. The truss company designs & builds all manufactured truss. That has been my experience. I'm just looking to supply realistic looking sections. Not actual sections. The solids tools are too slow for me at my level of experience. Link to comment Share on other sites More sharing options...
joey_martin Posted August 25, 2015 Share Posted August 25, 2015 Open the CAD details managment box and look at the truss detail. You can modify the truss from there. I use this tool to add duct chases in my floor trusses. Link to comment Share on other sites More sharing options...
HamlinBC Posted August 25, 2015 Share Posted August 25, 2015 I know this doesn't answer the question, but what is that distance?...can they even make a floor truss that small? Link to comment Share on other sites More sharing options...
ACADuser Posted August 25, 2015 Author Share Posted August 25, 2015 The floor truss is 14' long. Joey I'll see if I can find that CAD detail Link to comment Share on other sites More sharing options...
ACADuser Posted August 25, 2015 Author Share Posted August 25, 2015 David the truss layer is unlocked & I can only resize the truss, no other edit. Hamlin, this is the truss CA makes Joe, I can not find where to edit the truss except in a "CAD detail from view" where it becomes CAD lines and is a one way trip, no updates if the plan moves. I will be better off exporting to ACAD where I can work with lines etc more efficiently. Link to comment Share on other sites More sharing options...
HamlinBC Posted August 25, 2015 Share Posted August 25, 2015 Sorry, I should have clarified... What's the height of the floor system on the lower part (where the door is)? Can the truss company make a floor truss that short?...I was always under the assumption that 14" is about the minimum. They might recommend that you just handframe that whole section... I understand that Chief might show it, but that doesn't mean it can actually be built. Link to comment Share on other sites More sharing options...
ACADuser Posted August 25, 2015 Author Share Posted August 25, 2015 Oh I call that the truss height. It is 40" tall and drops to 16" tall. This type of truss is made like a roof truss with the truss being 1-1/2" wide and not the usual 3-1/2" floor truss width. I see no problem as only a floor load & no roof load applied to the truss. This is a very complex area where the stair makes it way to the 2nd floor which is 14' above the 1st floor. Link to comment Share on other sites More sharing options...
ACADuser Posted August 25, 2015 Author Share Posted August 25, 2015 Thinking about it more, you could a 16" truss I frame the floor up to the 40" level but a truss saves the carpenter some work. Link to comment Share on other sites More sharing options...
joey_martin Posted August 25, 2015 Share Posted August 25, 2015 Make sure the layer is unlocked. I modify them all the time from the TRUSS DETAIL in the CAD detail window. Link to comment Share on other sites More sharing options...
ACADuser Posted August 25, 2015 Author Share Posted August 25, 2015 Joey, Thanks for being persistent. I found that in the layer set within the "Open Truss Detail" has it's own layer set & indeed the layer was locked. How do you create your own objects in that screen? They are "Framing Members" I just copied what I needed. Link to comment Share on other sites More sharing options...
Joe_Carrick Posted August 25, 2015 Share Posted August 25, 2015 Alan, As an Architect with good Structural Engineering capabilities I sincerely question that truss since the top chord is not continuous. I don't see any way to adequately transfer the compression loads in the top chord across the step to the right support. It would make more sense to build up the floor either with a second set of trusses or joists. Link to comment Share on other sites More sharing options...
ACADuser Posted August 25, 2015 Author Share Posted August 25, 2015 Joe, Thanks for your input. I have done broken top cord trusses before but don't have the time to research it. As this is a recommendation to the truss mfg. I will go with it for now. It may be that they build a 16" truss with the extension on top to get the structural integrity needed. That too will save time for the carpenter. It will be 2-3 weeks before I get the actual truss profiles & will share the result with you. Attached is a balcony truss but not near the offset of this proposed truss. Thanks again. Link to comment Share on other sites More sharing options...
ACADuser Posted September 5, 2015 Author Share Posted September 5, 2015 Looks like the truss can be done. Don't have the data sheet for it yet only the price quote. Link to comment Share on other sites More sharing options...
Kelly_K Posted September 6, 2015 Share Posted September 6, 2015 Alan, As an Architect with good Structural Engineering capabilities I sincerely question that truss since the top chord is not continuous. I don't see any way to adequately transfer the compression loads in the top chord across the step to the right support. It would make more sense to build up the floor either with a second set of trusses or joists. Joe, That is a good point, however it can be done. I am not a structural engineer, but I have a fair enough understanding that I like to test them. As long as there is a compression situation you can substitute beefed up webbing along with lvl or larger dimensional lumber that can take stress of compression. Granted the conditions need to be right; the longer the truss the less likely the above can work. Link to comment Share on other sites More sharing options...
LonnieSmith Posted May 29 Share Posted May 29 Has anyone had any success with building a top chord-bearing floor truss? I can make a truss look the way I want using the Cross Section Tool, but then the truss plan does not match. The top Chord extension is held back to the inside notch of the truss. Link to comment Share on other sites More sharing options...
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